EDP Sciences
Free access
Volume 447, Number 2, February IV 2006
Page(s) 709 - 717
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20052979

A&A 447, 709-717 (2006)
DOI: 10.1051/0004-6361:20052979

Spectral energy distribution for GJ406

Ya. V. Pavlenko1, 2, H. R. A. Jones1, Yu. Lyubchik2, J. Tennyson3 and D. J. Pinfield1

1  Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK
    e-mail: yp@star.herts.ac.uk
2  Main Astronomical Observatory, Academy of Sciences of the Ukraine, Golosiiv Woods, Kyiv-127, 03680 Ukraine
3  Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

(Received 3 March 2005 / Accepted 18 October 2005 )

We present results of modelling the bulk of the spectral energy distribution (0.35-5 $\mu$m) for GJ406 (M6V). Synthetic spectra were calculated using the NextGen, Dusty and Cond model atmospheres and incorporate line lists for H2O, TiO, CrH, FeH, CO, MgH molecules as well as the VALD line list of atomic lines. A comparison of synthetic and observed spectra gives $T_{\rm eff}$ = $2800\pm 100$ K. We determine $M_{\rm bol} = 12.13 \pm 0.10$ for which evolutionary models by Baraffe et al. (2003, A&A, 402, 711) suggest an age of around 0.1-0.35 Gyr consistent with its high activity. The age and luminosity of GJ406 correspond to a wide range of plausible masses (0.07-0.1 $M_{\odot}$).

Key words: stars: individual: GJ406 -- molecular data -- stars: fundamental parameters -- stars: late-type -- stars: atmospheres -- stars: evolution

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